fchmod_opath() - why is this not in the kernel?

[Mike Gilbert <floppym@xxxxxxxxxx>]

The fchmod_opath() function in systemd seems like a hacky workaround
for a limitation in the kernel -- you can't call fchmod() on an fd
opened with O_PATH, and fchmodat() doesn't support the AT_EMPTY_PATH
flag.

Has any attempt been made to add this functionality in the kernel? If
someone has already tried and failed, I will refrain from making an
attempt myself.
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